Speed reduction mechanism



July 9, 1940. D. E. HUMPHREY SPEED REDUCTION MECHANISM 2 sheets-sheet 1 Filed Dec. 10, 1938 y 1940- D. E. HUMPHREY 2,206,958

SPEED REDUCT-I ON MECHANISM Filed Dec. 10, 1938 2 Sheets-Sheet 2 ATTORNEY.

Patented July 9, 1940 SPEEDMRED'UCTION MECHANISM.

Dee E. Humphrey, Dallas, Tex. I Application December 10, .1938, SerialNo. 244,903;

1 Claim.

This invention relates to new and useful improvements in mechanical reduction devices particularly adapted to pumping units.

This invention is filed as an improvement and in conjunction with my copendingapplication filed June 28, 1938, bearing the Serial Number One object of the invention is to provide a device simple in construction and cheap in manufacture and also which requires only a minimum up-keep cost. 7

Another object of the invention is to: provide a mechanism .whereby torque applied to suitable means positioned on a hollow shaft to transmit, through a series of rotary and stationary reduction gears, movement to a solid shaft arrangement within said hollow shaft, whereby suitable connections may be made to the ends of said solid shaft.

Another object of the inventionis to provide a device for gear reduction which is compact, easily assembled and disassembled for replacement of parts and which operates with a low coefficient of friction.

A further object of the invention is to provide a device for gear reduction in which a plurality of gear teeth are constantly in mesh, thereby reducing the possibility of stripping said gear teeth.

Still another object of the invention is to provide a gear reducing device particularly adapted for use in the pumping of wells which includes a continuous shaft extending from end to end, thereby insuring perfect synchronization and equal wear on the gears, and further insuring perfect unison in the movements of the pumping pitmans.

Another object of the invention is to provide a solid low speed drive shaft within a hollow high manner that high efiiciency is effected in gear reduction.

The invention will be more, readily understood from a reading of the following specification and by reference to the accompanying drawings wherein a means for carrying out the invention are shown and wherein:

Figure 1 is a side elevation of a gear'reduction a device constructed in accordance with the present invention. a l Figure 2 is a longitudinalvertical sectional view' of the same;

Figure 3 is a transverse vertical sectional View taken on the line 3-3 of Figure 1.

Figure 4 is a View similar to Figure 3 taken on the line 4-4 of'Figurel, and y Y a l Figure 5 .is a transverse vertical sectional view taken on the line 5-5 or Figure 1.

In the drawings thelnumeral .lfi designates .a suitable rectangular base having a housing ll mounted thereon. The housing comprises two sections A and B being suitably secured together by flanges C. An outboard bearing case D is similarly secured to the portion B at E.

A solid shaft I2 is mounted within thehousing l i and bearing case D. The ends it of this shaft protrude beyond the housing and case (Fig. 2), whereby pitman arms a (not shown) or otherl equipment to be operated may be secured thereto.

The shaft [2 is supported by suitable needle.

thereon. The end 20 is constructed to-form an eccentric (Figs. 3 and 4) for purposes hereinafter described. The double gear arrangement 2i provides two integral gears 22 and 23, said gears 23 being bell-shaped and having internal teeth 23'. The gear 22, as may be seen by observing Figure 2, is of a larger diameter than that of the gear 23.

The teeth 23 of the gear 23 engage the teeth It of the gear !5, while the gear 22 engages a stationary internal gear ring 24 mounted in the portion A.

A pulley wheel 25 is keyed at 26 to the hollow shaft I! in the space 2'! formed between the portion B andthe bearing case D. Fins 28 are formed on the wheel 25 whereby a cooling action is afforded to the bearing case D and the housing of the gear 22 (Figs. 3 and 4), and that said gear.

2| is secured to the portion 20 of the shaft I! only by means of needle bearings 30. Also a counter-balance weight W is suitably secured to the shaft I2 to off-set the cam action of said hollow shaft l2 (Figs. 2 and 4).

In operation a suitable connection is made between the pulley wheel 25 and a suitable source of power (not shown). As the wheel 25 is rotated, movement is imparted to the hollow shaft l1. The eccentric 20 causes the gear 22 to travel or walk around the larger diameter internal gear 24, while the gear I5 moves around the internal gear 23 in a like manner. Thus as the teeth of the gear 22 engage the stationary gear teeth of the ring 24 the gear 23 is rotated through. the movement of the eccentric 20 of the shaft 11.

The integral gear 23 is rotated with the gear 22 and will impart movement to the gear l5. This gear l5 being keyed to the solid shaft I2 will of course, rotate this shaft. As has been stated any mechanism to be operated may be secured to the ends I3 of the shaft l2.

Through the medium of the wheel 25 and shaft rotation of the gear arrangement is obtained,

and as stated rotation of the gears will impart movement to the shaft [2. The gears I5, 22, 23

and 24 are so arranged to, accomplish a reduction in speed between the shafts I! and I2.

That is if a predetermined ratio of 50 to 1 is established the number of teeth are so regulated as to accomplish the objective.

Any given ratio may be established by a change in the number of teeth in any one or all of the aforedescribed gears. It is to be particularly noted that at no time or place do the shafts l2 and I! contact each other and a space S is maintained continuously.

Entrance into the interior of the housing II may be had by merely removing the securing elements from the flanges C.

From the foregoing it may be seen that any desired reduction may be had with the above described invention, and as stated this device is cheap in manufacture and simple and sturdy in construction.

Manifestly, the construction as shown and described is capable of some modification and such modification as may be construed within the scope and meaning of the appended claim is also considered to be within the spirit and intent of the invention.

What is claimed is:

A mechanical movement comprising a centrally disposed driven shaft, a gear mounted upon said shaft, a hollow concentrically mounted driving shaft, an internal gear eccentrically mounted upon said hollow driving shaft, the teeth of said latter gear enmeshing a segment of the teeth of said first named gear, an external gear integrally formed with said internal gear, a stationary, internal ring gear enmeshing a segment of the teeth of said second named external .gear, a pulley wheel fixed to said hollow driving shaft, whereby torque transmitted to said pulley wheel will cause rotation of said centrally disposed shaft through said internal and external gears.

DEE E. HUMPHREY. 

